By way of update, the head of the NJMC's Natural Resources Department, Dr. Ross Feltes, writes:
According to Mark Mayer of NJDA, the beetles should be throughout the District in about three years and in five to 10 years MAM should no longer be a significant problem here.
Mike Newhouse and Gabrielle Bennett-Meany of the NJMC's Natural Resources staff have been assessing the activity of these beetles on MAM at sites as they conduct other studies and monitoring.
I asked them to stop at the Trust’s Skeetkill Marsh site Wednesday. They noted a conspicuous presence of the beetles on MAM. Though still present over many of the upland areas of the site, in their opinion the extent of MAM was much reduced relative to last year. [Thanks in part, no doubt, to the efforts of the volunteers.]
To be effective, it is necessary for the beetle population to grow at a site over successive years.
More on the beetles and Mile-a-Minute here.